SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
921 AM EDT MON SEP 15 2008
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
 
SYNOPSIS (VALID FROM 00Z SEP 15). UPPER FLOW PATTERN ACROSS
NORTHERN SOUTH AMERICA REMAINS ILL ORGANIZED...WITH A SHORT WAVE
TROUGH EXTENDING NORTHWEST ACROSS EASTERN BOLIVIA TO RONDONIA
BRASIL...WHILE A SHORT WAVE RIDGE CONFINES TO NORTHEAST BRASIL.
THIS...HOWEVER...IS NOT HAMPERING TROPICAL CONVECTION DEVELOPMENT
OVER AMAZONAS-PARA IN BRASIL...WITH MOST INTENSE DEVELOPING
BETWEEN 03S-07S.

THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH ENTRANCE AT 37S
110W...THEN ALONG 42S 95W...EXITING AT 47S 78W. IT REFORMS NEAR
52S 96W...ALONG 60S 91W...EXITING AT 69S 92W. THE SOUTHERN POLAR
REFORMS AT 69S 57W...THEN ALONG 63S 39W...EXITING OVER THE SOUTH
GEORGIA ISLANDS. THE NORTHERN POLAR LIES ALONG 34S 120W...A 128KT
MAXIMUM AT 36S 102W...EXITING AT 42S 73W. IT REFORMS OVER THE
ATLANTIC NEAR 30S 48W...ALONG 32S 37W...43S 23W...A 163KT MAXIMUM
AT 38S 11W...AND 32S 01W. THE SUBTROPICAL JET LIES ALONG 29S
120W...29S 112W...34S 95W...EXITING AT 35S 79W. IT HAS A FINGER
FARTHER NORTH WITH AXIS BETWEEN 21S 92W AND 23S 78W. IT REFORMS
AT 25S 67W...CROSSING SAO PAULO BRASIL...27S 37W...36S 23W...30S
06W...AND 29S 00W.

AT 500 HPA...A BROAD TROUGH DOMINATES THE SOUTHERN STREAM OVER
THE SOUTHEAST PACIFIC...AS IT ENVELOPS AREA BETWEEN 125W-70W AND
SOUTH OF 25S. PROGRESSIVE PERTURBATIONS ARE REVOLVING AROUND THIS
AXIS...WITH ONE ALONG 50S 100W...40S 107W...TO 32S 123W. ANOTHER
EXTENDS ALONG 60S 90W...50S 90W...TO 43S 93W. WEAKER
PERTURBATIONS ARE PUSHING FARTHER EAST ACROSS EXTREME SOUTHERN
CHILE/PATAGONIA. A SKEWED RIDGE EXTENDS FROM 30S 80W...ACROSS
NORTHERN PATAGONIA...50S 50W...THEN SOUTHWEST TO THE ANTARCTIC
PENINSULA. OVER THE ATLANTIC...A LOW NEAR 37S 42W ANCHORS A
TROUGH BETWEEN 52W-28W AND SOUTH OF 23S.

AT LOW LEVELS...A BROAD TROUGH DOMINATES THE SOUTHERN STREAM OVER
THE FAR EASTERN PACIFIC...WITH AN OCCLUDED 946 HPA LOW AT 66S
104W...AND A POLAR FRONT ALONG A 972 HPA TRIPLE POINT LOW AT 65S
88W...62S 79W...58S 83W...A 988 HPA LOW AT 54S 86W...53S 79W...A
1002 HPA LOW AT 49S 82W...47S 77W...43S 79W...A 1010 HPA LOW AT
44S 83W...37S 89W...AND 35S 98W. ANOTHER FRONT EXTENDS ALONG A
990 HPA LOW AT 61S 71W...A 998 HPA TRIPLE POINT LOW AT 61S
65W...57S 58W...54S 65W...A 1014 HPA LOW AT 51S 69W...45S
65W...TO NORTHERN PATAGONIA. ON THE NORTHERN STREAM...A 1025 HPA
HIGH NEAR 29S 86W ANCHORS A RIDGE OFF THE CENTRAL COAST OF CHILE.
OVER THE ATLANTIC...A DEEP 1002 HPA OCCLUDED LOW CENTERS NEAR 37S
42W. AN ELONGATED FRONT LIES ALONG A 1014 HPA LOW AT 35S
26W...32SW 26W...29S 28W...A 1016 HPA LOW AT 28S 33W...23S
36W...RIO DE JANEIRO...SOUTHERN MINAS TO THE BOLIVIAN JUNGLE.  A
1021 HPA POLAR HIGH CENTERS NEAR 26S 45W.

GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE) 
DAVISON...HPC (USA)